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Transcript
programmable micro-ohmmeter OM 21 High resolution: 0.1 µΩ OM21 micro-ohmmeter is used for four-wire resistance measurement of very low values (with a resolution of 0.1 Ω) up to 20 kΩ, with an excellent accuracy. Programmable by RS232 or IEEE 488 link High accuracy: 0.03% It can be powered from mains or from rechargeable batteries. Choice of current waveforms The instrument is calibrated electronically, with no internal adjustment needed. Storage and analysis of 1 000 measurements Applications......................................... • Cable resistance and resistivity measurements - High resolution (0.1 µΩ), - Compensation for sample temperature and thermal emfs, - Display in Ω/km. • Metallisation and ground continuity measurements - GAM-EG13 standards, - Pulsed or alternate current (10 A), - Automatic compensation for thermal emfs. • Contact resistance measurements (connectors, switches, relays) - Standard NFC 93050, DIN/IEC, - Maximum measurement Voltage limited to 20 or 50 mV, - Automatic compensation for thermal emfs. • Inductive resistance measurement (motors, transformers, etc.) - Total protection against overvoltages - Direct current, - Compensation for thermal emfs and for sample temperature, - Automatic calculation of winding heating. • Measurement of heat-sensitive devices (thermistors, temperature-sensitive components) - Single-shot, pulsed current, very low power delivered. general specifications Display ............................................... 26 000 counts, 16-segment illuminated LCD, 11.5 mm high, alphanumeric characters for messages, measurement indication includes value and unit of measurement. Incorrect connections or measurements going beyond range are indicated by an error message. Manual or automatic range change. Manual or automatic measurement triggering, with measurement rate programmable from one measurement per second to one per hour. Four-wire measurement. Measurement current........................... • Amplitude selection (from 100 µA to 10 A, • Waveform selection - continuous, - alternate pulses, - positive pulses, • With each type of current, measurements can be single-shot or repetitive (pos- 1 sibility to select the repetition rate), • Current may also be supplied from an external source. Measurement time............................... < 1 second in continuous mode, < 1.5 second in pulsed mode, < 2 seconds in alternating pulsed mode. Protection ........................................... • Electronic protection against break-of f currents when measuring an inductive resistance, • Possibility of limiting the voltage across the resistor terminals to 20 or 50 mV. Environment ........................................ Nominal operating range: 0 to 50°C, 20 to 75% relative humidity. Operating range limits: -10 to 55°C, 10 to 80% relative humidity. Power supply ...................................... • 110/220 VAC ± 10%, 50/60 Hz, • optional battery with built-in charger. Presentation........................................ Bench unit with optional rack mounting kit. Dimensions: 225 x 88 x 300 mm. Weight: 2 to 3 kg depending on options. functions The instrument measures very low value resistances in a four-wire terminal. It has eight measurement ranges. For the same current, the range can be changed manually or automatically. The user has a choice of three current values for each measurement range, except for the extreme ranges. Temperature coefficient < 10% of the accuracy per degree Celsius. Automatic compensation for thermal electromotive forces (emfs) .................. Range Resolution Measurement current Voltage drop Accuracy (1) 2 mΩ 0.1 µΩ 10 A 20 mV 0.05% + 0.3 µΩ 20 mΩ 20 mΩ 1 µΩ 1 µΩ 10 A 1 A 200 mV 20 mV 0.05% + 2 µΩ 0.05% + 3 µΩ 200 mΩ 200 mΩ 200 mΩ 10 µΩ 10 µΩ 10 µΩ 10 A 1 A 100 mA 2 V 200 mV 20 mV 0.05% + 10 µΩ 0.05% + 20 µΩ 0.03% + 30 µΩ 2 Ω 2 Ω 2 Ω 100 µΩ 100 µΩ 100 µΩ 1 A 100 mA 10 mA 2 V 200 mV 20 mV 0.05% + 100 µΩ 0.03% + 200 µΩ 0.03% + 300 µΩ 20 Ω 20 Ω 20 Ω 1 mΩ 1 mΩ 1 mΩ 100 mA 10 mA 1 mA 2 V 200 mV 20 mV 0.03% + 1 m Ω 0.03% + 2 m Ω 0.03% + 3 m Ω 200 Ω 200 Ω 200 Ω 10 mΩ 10 mΩ 10 mΩ 10 mA 1 mA 100 µA 2 V 200 mV 20 mV 0.03% + 10 mΩ 0.03% + 20 mΩ 0.03% + 30 mΩ 2 kΩ 100 mΩ 100 mΩ 1 mA 100 µA 2 V 200 mV 0.03 % + 100 mΩ 0.03 % + 200 mΩ 20 kΩ 1 Ω 100 µA 2 V 0.03% + 1 Ω (1) The accuracy is given as ± (% of the reading + counts).The count corresponds to the value of the last figure displayed, i.e. to the resolution on this range. The accuracy is given over 90 days at 23±1°C. additional functions Automatic temperature compensation of the element measured for temperatures between 0°C and 100°C ............. The instrument calculates the resistance value at 20°C. Element temperature is: - either programmed, - or is measured by a platinum resistance probe (Pt100). Metal type, or its temperature coefficient, is indicated on the OM. Relative measurements ........................ The instrument can display: • either D = M-R, • or D = (M-R)/R (i.e. direct read-out in %) (D = reading display, M = value measured, R = stored reference value). Memory .............................................. Up to 1 000 measurements can be stored, along with their mean, minimum or maximum, and can be read back on the readout or through digital or analog interfaces. Two programmable thresholds.............. With output on two relays (1 A/220 V AC). Floating analog output ......................... 0 to 2.5 V (load ≥ 2.5 kΩ, 10 mV resolution). An image can be constructed of all or part of the measured values: the origin and extent of the measurements can be programmed to get a "zoom" effect. The measurement values stored in the memory can be extracted and output in the form of analog voltages. Calculations......................................... OM21 can calculate automatically the heat-up of a motor or transformer. Similarly it can calculate the resistance per km of single core or multi-core cables. RS 232C and IEEE 488-2 interfaces ...... The standard RS 232C and optional IEEE 488-2 interfaces make it possible, by computer, to: • program the instrument completely, • analyse the measurements (curve plot, printout, etc.) • calibrate the instrument. 2 software The PC software allows programming of the OM21 or 22 from a compatible PC. It is menu-driven, with the operator completely guided by a question and answer system. A second function of the software is to ma- nipulate the stored readings; transfer into the PC memory or onto a disk in a file which can be used for spreadsheets; presentation of the readings in the form of tables or graphs. Labview driver .................................... This driver, delivered, on request, free of charge with IEEE version, allows to connect OM with Labview, to command the microhmmeter (OM 21 or 22 with IEEE) from a PC and to process the data. Large Kelvin clip - AMT 004 One measurement lead with a large Kelvin clip. Length of wire: 3 m. Equipped of two 4 mm security banana plugs. Maximum opening of clip: 3 cm. Maximum current: 10 A. Carrying case - AN 6901 A soft carrying case designed for storage and transport of all bench type instruments (OM 21, 22). Dimensions: 31 x 26 x 14 mm. accessories KELVIN lead set - AN 5806 A pair of measurement leads, each with a KELVIN clip, 1.20 m of wire and two 4 mm plugs. The KELVIN clip can be used for four-wire measurement because there is a perfect galvanic isolation between the current input and the voltage connector. Gold-plated contacts. Maximum opening: 1.2 cm. Maximum current: 10 A. Kelvin test probe - AMT 003 One measurement lead with a dual probe (concentric). Length of rod: 85 mm. Diameter of rod: 8 mm. Length of wire: 3 m. Equipped of two 4 mm security banana plugs. Maximum current: 10 A. Probe body section Current lead Clamping device - 2381 With the help of the clamping device type 2381 and a microhmmeter, the ohmic resistances of test cables and samples of materials in the shape of cords or strips can be measured. Fields of application include production monitoring, quality assurance and general test measurements. The 2381 consists of a robust, warp-resistant, light-metal rail with one movable and one rig clamping device. It allows the measurement of samples 1000 mm long. The clamping device is designed to accommodate cable cross-sections of 0.1 mm2 to approx. 100 mm 2. It is equipped with a wire guide 2388. Dimensions: 170 x 2100 x 250 mm. Weight: 25 kg. Rack mounting kit - AN 5884 This kit allows rack mounting of bench instruments. It includes 2 brackets (AN 5883) and a 19" rack panel (3 U). Isolator Voltage lead ordering instructions RS 232 programmable micro-ohmmeter Basic instrument 10 A Basic instrument 10 A + battery and charger Basic instrument 10 A + IEEE 488-2 Basic instrument 10 A + IEEE 488-2 + battery OM 21-1 OM 21-2 OM 21-3 OM 21-4 Accessories ........................................................................ Kelvin lead set AN 5806 Large Kelvin clip AMT004 Kelvin micro-probe AMT003 Clamping device 2381 Wire guide 2388 Carrying case AN 6901 Brackets for panel mounting AN 5883 Rack mounting AN 5884 RS 232 cable (9-25 pin, female) (1) AN 5874 RS 232 cable (9-9 pin, female) (1) AN 5875 RS 232 cable (9-25 pin, male) (1) AN 5876 IEEE 488 cable AN 5836 PC 9/25 pin converter AN 5894 Labview driver OM2-LABV-DRIV For OM21-1 and 21-3: power supply 3 V/10 A AMT002 (1) The RS 232 connector is a 9 pin female B.P. 182 - F 91006 EVRY Cedex Tel. 33 1 69 36 50 60 Fax 33 1 60 77 82 97 Email: [email protected] Specifications are subject to modification without prior notice 3